var noticebtn = document.getElementById("noticebtn");
noticebtn.onclick = function() {
    alert("活动还未开始！");
}

//图片轮播
var ppt = document.getElementById('ppt'),
    pic = document.getElementById('pic').getElementsByTagName("li"),
    list = document.getElementById('list').getElementsByTagName('li'),
    index = 0,
    timer = null;

// 定义并调用自动播放函数
timer = setInterval(autoPlay, 3000);

// 鼠标划过整个容器时停止自动播放
ppt.onmouseover = function() {
    clearInterval(timer);
}

// 鼠标离开整个容器时继续播放至下一张
ppt.onmouseout = function() {
        timer = setInterval(autoPlay, 3000);
    }
    // 遍历所有数字导航实现划过切换至对应的图片
for (var i = 0; i < list.length; i++) {
    list[i].onmouseover = function() {
        clearInterval(timer);
        index = this.innerText - 1;
        changePic(index);
    };
};

function autoPlay() {
    if (++index >= pic.length) index = 0;
    changePic(index);
}

// 定义图片切换函数
function changePic(curIndex) {
    for (var i = 0; i < pic.length; ++i) {
        pic[i].style.display = "none";
        list[i].className = "";
    }
    pic[curIndex].style.display = "block";
    list[curIndex].className = "on";
}

//二维码吸顶灯效果
var erweimaEle = document.querySelector("#erweima");

window.onscroll = function() {
    var num = document.documentElement.scrollTop;
    // console.log(num);
    if (num >= 695) {
        erweimaEle.style.position = "fixed";
        erweimaEle.style.top = "0px";
        erweimaEle.style.right = "10%";
    } else {
        erweimaEle.style.position = "absolute";
        erweimaEle.style.top = "0px";
        erweimaEle.style.right = "0px";
    }
}